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Budapest's first line, Line 1, was completed in 1896.[5][6] The M1 line became an IEEE Milestone due to the radically new innovations in its era: "Among the railway's innovative elements were bidirectional tram cars; electric lighting in the subway stations and tram cars; and an overhead wire structure instead of a third-rail system for power."[7] In 2002, the M1 line was listed as a UNESCOWorld Heritage Site.[8]
^Mátyás Jangel (September 2010). "Közszolgáltatási szerződés, utasjogok, a szolgáltatástervezés és ellenőrzés folyamata a kötöttpályás helyi- és elővárosi közforgalmú közlekedésben" [Public service contract, passenger rights, service planning and monitoring process of local and suburban public transport rail] (in Hungarian). BKV Zrt. Közlekedési Igazgatóság [Directorate of Public Office. Transport]. pp. 10 (and 3). Archived from the original(pdf) on 2015-01-28. Retrieved 2015-04-19. Metro usage per day – Line 1: 120,000; Line 2: 405,000; Line 3: 630,000. (Line 4 began operations in 2014, with a 110,000 ridership estimated by Centre for Budapest Transport (BKK) based on the latest year.)